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arXiv 1204.6301astro-ph.COastro-ph.IM
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本地星系团的比较研究:I。导出的X射线观测值

A Comparative Study of Local Galaxy Clusters: I. Derived X-ray Observables

Eduardo Rozo, Eli S. Rykoff, James G. Bartlett, August E. Evrard

摘要:

我们研究了由三个不同的小组报告的星系团导出的X射线性质的系统差异:Vikhlinin等人(2009 a),Mantz等人(2010 b)和Planck Collaboration(2011 b)。任何两对作品之间的样本重叠范围在16到28个星系团之间。我们发现系统的差异,在大多数报道的属性,包括总集群质量,M500。最极端的情况是普朗克协作组(2011 b)和Mantz等人(2010 b)在z > 0.13的星系团(平均超过16个星系团)中,星系团质量平均相差45% \pm 5%。这些质量差异导致在R500孔径内定义的集群观测值的差异。在考虑孔径差异后,我们发现不同群体之间的气体质量估计非常一致。然而,软带X射线亮度LX、核心切除光谱温度TX和气体热能YX = MgasTX显示5%-15%水平的平均差异。我们还发现,普朗克合作组(2011 b)中的低(z \leq 0.13)和高(z \geq 0.13)星系团样本似乎存在系统性差异:低和高红移子样本的YSZ/YX比分别为ln(YSZ/YX)= -0.06 \pm 0.04和ln(YSZ/YX)= 0.08 \pm 0.04。

英文摘要:

We examine systematic differences in the derived X-ray properties of galaxy clusters as reported by three different groups: Vikhlinin et al. (2009a), Mantz et al. (2010b), and Planck Collaboration (2011b). The sample overlap between any two pairs of works ranges between 16 to 28 galaxy clusters in common. We find systematic differences in most reported properties, including the total cluster mass, M500. The most extreme case is an average 45% \pm 5% difference in cluster mass between the Planck Collaboration (2011b) and Mantz et al. (2010b), for clusters at z > 0.13 (averaged over 16 clusters). These mass differences induce differences in cluster observables defined within an R500 aperture. After accounting for aperture differences, we find very good agreement in gas mass estimates between the different groups. However, the soft-band X-ray luminosity, LX, core-excised spectroscopic temperature, TX, and gas thermal energy, YX = MgasTX display mean differences at the 5%-15% level. We also find that the low (z \leq 0.13) and high (z \geq 0.13) galaxy cluster samples in Planck Collaboration (2011b) appear to be systematically different: the YSZ/YX ratio for these two sub- samples is ln(YSZ/YX) = -0.06 \pm 0.04 and ln(YSZ/YX) = 0.08 \pm 0.04 for the low and high redshift sub-samples respectively.

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